Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5ddb778c2d9846…

MALICIOUS

PDF

42.2 KB Created: 2021-06-22 12:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9a6160e2919eb97a6cdfcec8e61fd19a SHA-1: e010b4bca045060ed2abe10593e992998dcec8b5 SHA-256: cf5ddb778c2d98464a80b139404073e180519534b2e8a460977f6dcb82c5f151
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting, likely to facilitate the download of further malicious content. The embedded URLs and the nature of the link farm suggest an attempt to disguise malicious activity under the guise of search engine optimization or content aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8347

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=pokemon+victory+fire+gba+download PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcfc1468df---78080631125.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b697cfe4---84638654033.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f671038b325a9cebdc5f54b0f19e0ef6/67446435119.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/78227101019.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/butujunab.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7e0ed1bd3b62e3cf5220be92dbcd04ba/50761416056.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcaa560251---daveliwikepoves.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c389eeef1bf---vejiponenakorik.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622885531.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087634295247---sodevawalakitemotas.pdfIn PDF document text
    • http://ledins.lv/cms/file/19191194261.pdfIn PDF document text
    • https://mmszke.hu/files/file/bawoxozegata.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/430949e441d76aecf0e406b908464bee/pasuwolelawumawedij.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/27507859270.pdfIn PDF document text

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